Help opening files in double for loop

[jim744]

I am trying to open a file in a double for loop using the variable of the first loop as the directory and the second variable as the file.

for(int i = 0; i < variable; i++)
{
  for(int j = 0; j < variable2; j++)
  {
    ifstream fin;
    fin.open(i / j);
    //read data from file
  }
} 

[Galik]

You could use a std::ostringstream to convert your numbers into strings a bit like this:

for(int i = 0; i < variable; i++)
{
  for(int j = 0; j < variable2; j++)
  {
    ifstream fin;

    ostringstream oss;
    oss << i << '/' << j;

    fin.open(oss.str().c_str());
    //read data from file
  }
}

http://cplusplus.com/reference/iostream/ostringstream/

[jim744]

Do I have to include a library to use it?

[Galik]

Yes:

#include <sstream> 

:-)

[jim744]

Thanks I got it working now.